12:15a These are the ones who crossed the Jordan in the first month

They went across to the west side of the Jordan river during the first month of the year.
-or-
Once they dared to cross to the west side of the Jordan River in March.

12:15b when it was overflowing all its banks,

At that time the water in the river was very deep and wide. (EEB)
-or-
It was the time of year when the river was full with water.

12:15c and they put to flight all those in the valleys, both to the east and to the west.

They chased from there all the people who lived in the valleys on both sides of the river. (Translation for Translators)
-or-
And then they fought the people in the valleys and those people had to run away. They ran to the east and to the west. (Easy English Bible)

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